Gemstone



FIG. 1 is a top view of a gemstone showing my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a side view thereof, with the opposite side view, front view and rear view being identical thereto; and,

FIG. 4 is a top side elevation view thereof. 

CLAIM The ornamental design for a gemstone, as shown and described. 